In the given electrochemical cell, $Ag(s)|AgCl(s)|{FeCl}_{2}(aq),\ {FeCl}_{3}(aq) \mid Pt(s)$ at 298

Question

In the given electrochemical cell, $Ag(s)|AgCl(s)|{FeCl}_{2}(aq),\ {FeCl}_{3}(aq) \mid Pt(s)$ at 298 K , the cell potential ( $E_{\text{cell~}}$ ) will increase when :

(A) Concentration of ${Fe}^{2 +}$ is increased.

(B) Concentration of ${Fe}^{3 +}$ is decreased

(C) Concentration of ${Fe}^{2 +}$ is decreased

(D) Concentration of ${Fe}^{3 +}$ is increased

(E) Concentration of ${Cl}^{-}$ is increased

Choose the correct answer from the options given below:

Accepted Answer

${Cl}_{aq}^{-} + {Ag}_{(S)} + {Fe}_{aq}^{+ 3} \rightarrow {Fe}_{aq}^{+ 2} + {AgCl}_{(S)}$

$$E_{\text{cell~}} = E_{\text{cell~}}^{\circ} - \frac{0.059}{1}log\frac{\left\lbrack {Fe}^{2 +} \right\rbrack}{\left\lbrack {Cl}^{-} \right\rbrack\left\lbrack {Fe}^{3 +} \right\rbrack}$$

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